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Post by smalljawbasser on Apr 28, 2015 14:39:35 GMT -5
.45 rempac, sabotless, straight H4198. do i need a .030 or .040 bushing plug?
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Post by rangeball on Apr 28, 2015 14:44:15 GMT -5
How fast do you plan to push what bullet?
I currently shoot the 310gr APB and had the .040 bushing installed and PFC opened up fully to 7/32. I did this to get the most flame to the charge as possible to offset potential temp instability with a single powder and to avoid any PFC crud build up and primer bulging should I push the FPS. I'm at 70gr currently and don't plan to go any higher with this bullet but may bump it to 78gr if I decide to shoot a 275gr class bullet.
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Post by Richard on Apr 28, 2015 19:51:09 GMT -5
I would personally start with a .030" bushing. I have shot them from .023 to .045 and would say the .030 is as good as any. If you get into this game, you may subsequently give the .040 a try along with a new bushing and you may also want to play with the PFC (primer flame channel) that is the area between the bottom of the primer up to the bushing. It is in the area of 5/32" from the factory and some, as Rangeball indicated have opened that up to 7/32". Once you do that, you can't close it back up? You can always open it and change the bushing or just get another BP to play with.
Richard
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Post by Deleted on Apr 28, 2015 20:54:30 GMT -5
What temp do you hunt in is what would make the difference imo...The .040...bushing is working well in the guns that people post here....I have a .030 in my remmac and have no complaints in above freezing temps...The h4198 will fall through a .040 bushing, recently brought up on the new 209 centerfire bolt conversion
Airborneike posted....
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Post by smalljawbasser on Apr 29, 2015 8:57:21 GMT -5
i am in northeast TN. hunting temps from teens to 60. 250/300 gr bullets only at hunting velocities. no hotrodding, lo long range target shooting.
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Post by 7mmfreak on Apr 29, 2015 11:22:50 GMT -5
What temp do you hunt in is what would make the difference imo...The .040...bushing is working well in the guns that people post here....I have a .030 in my remmac and have no complaints in above freezing temps...The h4198 will fall through a .040 bushing, recently brought up on the new 209 centerfire bolt conversion Airborneike posted.... I load my .040 bushing with a spent primer in place |
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Post by rambler on Apr 29, 2015 12:10:00 GMT -5
Go to an .030 bushing. Where you live temps and pfc shouldn't be an issue. If you can find IMR4198 then your options are open.
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Post by schunter on Apr 29, 2015 12:17:57 GMT -5
What temp do you hunt in is what would make the difference imo...The .040...bushing is working well in the guns that people post here....I have a .030 in my remmac and have no complaints in above freezing temps...The h4198 will fall through a .040 bushing, recently brought up on the new 209 centerfire bolt conversion Airborneike posted.... I load my .040 bushing with a spent primer in place Keith, Have you ever forgot to put in a new primer before trying to fire that next round? I could see myself looking at the gun after loading and seeing a primer in there and not replacing it. Wouldn't make a difference during a bench session I know. Just thinking out loud about possibly not doing it in a hunting situation and get a shot at a second animal and it going SNAP..... Scott |
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Post by rangeball on Apr 29, 2015 12:20:28 GMT -5
My bench procedure, I load, shoot, then load, work bolt, eject spent primer, replace, close bolt, shoot repeat.
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Post by smalljawbasser on Apr 29, 2015 15:11:25 GMT -5
Go to an .030 bushing. Where you live temps and pfc shouldn't be an issue. If you can find IMR4198 then your options are open. !@#$% i just spent a week finding H4198 and buying 8lbs of it! |
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Post by 12ptdroptine on Apr 29, 2015 15:16:44 GMT -5
A all chance of granules falli g on the way of the.primer IF you as many do load over a SPENT primer . The oressure you apply should keep any granules.from shifting while you exchange the spent primer for an inspent one
A very small chance but yet a chance
Drop
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Post by rangeball on Apr 29, 2015 15:17:14 GMT -5
You'll be fine. I don't think this is a big problem, especially if you follow good loading procedure. I shoot H4198 with the .040 bushing. If you're really worried about go with the .030 bushing.
As for concern about H4198 making it through a .040 bushing, back when I was deciding to go with the larger bushing we discussed this possibility and the general consensus was it wasn't worth worrying about.
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Post by Deleted on Apr 29, 2015 15:18:49 GMT -5
Go to an .030 bushing. Where you live temps and pfc shouldn't be an issue. If you can find IMR4198 then your options are open. !@#$% i just spent a week finding H4198 and buying 8lbs of it! H4198 and IMR4198 are basically the same thing. I wonder l wouldn't worry about which one you have and just go shoot you have the most common used powder and you'll be fine IMO. |
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Post by Deleted on Apr 29, 2015 15:21:05 GMT -5
H-4198 will work fine in your gun. I use .030 bushings in all My .45s and have never had an issue. yes powder will come through a .040, maybe not much but it will. the tighter the seating pressure, the more likely to push powder out, especially with full form bullets.
not an issue for most but it can and does happen.
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Post by rambler on Apr 29, 2015 15:45:33 GMT -5
Hankins posted a pic of a side by side comparison of H4198 and IMR4198, the IMR is a little longer and fatter.
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Post by Richard on Apr 29, 2015 18:51:31 GMT -5
I tend to stay with H-4198 because it meters better thru my Harrell's powder measure. I have r un them side by side for accuracy and velocity and found little or no difference. Those couple kernels that might migrate into the bushing hole?  ? One they get that hot spark, they are history! Richard |
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Post by al53 on Apr 29, 2015 19:50:12 GMT -5
does it make a difference in what temp you will be shooting in for bushing size...say i was shooting in 30* weather mostly...what bushing would be best or does it not matter....shooting straight 4198 no duplex...
i am trying to learn as much as I can as I am having a rifle built and i have to say there are some very very smart people here and gave me a better concept of the SML..I even read to old board pages...thanks
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Post by Deleted on Apr 29, 2015 20:02:59 GMT -5
does it make a difference in what temp you will be shooting in for bushing size...say i was shooting in 30* weather mostly...what bushing would be best or does it not matter....shooting straight 4198 no duplex... i am trying to learn as much as I can as I am having a rifle built and i have to say there are some very very smart people here and gave me a better concept of the SML..I even read to old board pages...thanks Imo a .040 bushing would be advantageous in a very cold environment, ignition wise...Earnhardt shoots in sub zero temperatures sometimes and no report of ignition problems with single powders, Duplexing helps ignition in cold weather also and the 10/60 4759/h4198 has shown to be temperature stable load.... |
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Post by Deleted on Apr 29, 2015 20:05:25 GMT -5
I have shot my .030 bushings down to close to 0 degrees and it still goes bang, not saying the .030 is better than an .040, just saying it works well for most applications...
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Post by rangeball on Apr 30, 2015 8:42:15 GMT -5
In my opinion the thing to consider isn't necessarily just getting ignition, but the loss of fps in colder temps. May not be as big a consideration on a shorter shot, but if you're set up and planning to shoot longer range, a slower launch speed could affect your outcome.
I'm pretty sure TG has trace data that shows the FPS of 4198 at warm to cold temps, the drop off with a .030 plug can be significant, which is generally why guys duplex. The .040 provides more complete ignition to hopefully offset this and make the single work more like a duplex.
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Post by Richard on Apr 30, 2015 11:32:03 GMT -5
There are a lot of opinions regarding bushing size. I have shot bushings from .023 to .040 and under normal weather conditions, have not seen any major difference in accuracy or velocity? But that is me? I do not shoot under adverse conditions. As Bill indicated, he has shot the .030 bushing down to 0* with his load. A duplex load with a quick booster would, in all probability work in most conditions with a .030 bushing and a standard primer? On the other hand, a single powder load under very cold conditions with a standard primer might go.........."Poof"? Substitute a magnum primer with the same bushing and load and ignition might be just fine? Truth of the matter is, you really have to try these loads yourself to get first hand knowledge of what does and does not work for you in your gun with your load? I might shoot a load with Clays as my booster and you might use 4759 and get a dud?.......I might seat my bullets tighter or use a different wad and get ignition where you might not? Your barrel might be .0002" tighter and produce more pressure which will give ignition? So, lots of variables and I don't think there is ONE right way?
Richard
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Post by Deleted on Apr 30, 2015 12:25:23 GMT -5
I have shot my .030 bushings down to close to 0 degrees and it still goes bang, not saying the .030 is better than an .040, just saying it works well for most applications... X2, my hillbill Mcrem 45 has a .030 bushing, works flawless to this point, no matter the conditions. I may consider an .040 bushing if I were moving to slower powders, but for what I use, the .030 works great and has never let me down. |
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Post by rangeball on Apr 30, 2015 14:13:38 GMT -5
I have shot my .030 bushings down to close to 0 degrees and it still goes bang, not saying the .030 is better than an .040, just saying it works well for most applications... X2, my hillbill Mcrem 45 has a .030 bushing, works flawless to this point, no matter the conditions. I may consider an .040 bushing if I were moving to slower powders, but for what I use, the .030 works great and has never let me down. Guy, have you noticed fps loss at cold temps with a single and .030 bushing? |
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Post by Deleted on Apr 30, 2015 14:41:58 GMT -5
X2, my hillbill Mcrem 45 has a .030 bushing, works flawless to this point, no matter the conditions. I may consider an .040 bushing if I were moving to slower powders, but for what I use, the .030 works great and has never let me down. Guy, have you noticed fps loss at cold temps with a single and .030 bushing? My 45 Mcrem is only loaded with Dave's recipe of N110/H322, it shoots lights out and weather has no affect so I will likely never switch loads with that gun. I know Dave did extensive testing and definitely saw a fps loss shooting straight 4198, but I'm not sure what size bushing he was using, I would assume it was an .030 |
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Post by rangeball on May 1, 2015 8:46:44 GMT -5
Thanks, didn't know you were shooting a duplex, ie the great equalizer  I think the .030 v .040 debate is of greater importance to guys shooting singles in cold temps. |
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Post by scottypotty on May 4, 2015 12:13:31 GMT -5
When shooting duplex loads do you just reduce the amount of powder to get your total? If I'm shooting 60gns H4198 and want to try duplex then I would use like 10gns of N110 and 50gns of H4198?
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Post by jims on May 4, 2015 15:26:56 GMT -5
That is a load used by many and it has worked well.
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