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Post by yankee on Apr 21, 2009 17:52:30 GMT -5
took the encore and the chrono to the range today, both slugs fired were 300 grains each with 110gr triple 7 2f by volume W209 primers 9 SST's were run over the chrony average muzzle velocity 1811 fps 6 XTP's were run over the chrony average muzzle velocity 1778 fps i did learn that with my chrony set-up i had to move chrony out to about 12ft, and im unsure if that will or will not make a big difference in readings??? reason i had to move it farther out was muzzle gases at 6' were rocking my tripod pretty good, giving false readings the first photo is of the bench and chrony and MZLER  first SST  2nd SST  3rd SST  4th sst  and the sst were all pretty much in this range, give or take, i got 9 photo's of SST speeds, but now for the xtp's  XTP#2  xtp#3  xtp#4  final target at 100yds, the top or highest bunch is SST the bunch at 9oclock of the bull is XTP  |
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Post by Deleted on Apr 21, 2009 19:05:05 GMT -5
yankee That's about what I get with 300gn bullets and 110gns Blackhorn. I set my chrono at 10-12ft also. You might want to think about making a shield to protect your investment. It's just a matter of time until a sabot is going to do some damage to the face of your chrono if left unprotected. The shield I made is covered with sabot imprints.  Good luck..Zen |
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Post by yankee on Apr 21, 2009 19:26:28 GMT -5
i have a 10" wide peice of plexiglass i lean up against the face of the chrony, i did so cuz i wasn't sure about sabot hitting the face of my chrony, i was surprised the average velocity of the 2 was as close as it was
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Post by ourway77 on Apr 22, 2009 6:48:06 GMT -5
Hey nice informative post. This is what forums are all about. We sure learn by other's tries and failures. Again Thanks Lou
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Post by tpcollins on Apr 24, 2009 15:18:06 GMT -5
Yankee - were you shooting for group or just checking your chrono? I saw some of these 250 and 300 grain SST this week, man they are huge!
How about setting up your chrono right in front of the target and let us know what the velocity is at 100 yards? It would really be interesting to know that info.
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Post by wilmsmeyer on Apr 24, 2009 16:04:47 GMT -5
Your funny chrono readings were probably due to the sabot passing over the chrony that close. 6'....YIKES.
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Post by yankee on Apr 25, 2009 11:32:47 GMT -5
Yankee - were you shooting for group or just checking your chrono? I saw some of these 250 and 300 grain SST this week, man they are huge! How about setting up your chrono right in front of the target and let us know what the velocity is at 100 yards? It would really be interesting to know that info. just for you TP, i'll try to arrange that tomorrow, right now im in the middle of some thunderstorms, gonna take a pretty good centering shot to get a reading, what kinda fps you think they may be??? i already know what the fps is going to be, plus minus 50fps, cuz i did this once, but didn't record it with pictures, i happen to have some custom made 202gr all copper slugs made on a CNC shall i clock those also?? maybe get 200yd reading??? im being kinda sarcastic here cuz my last tests got slammed by you, so i have a feeling no matter whats done im wasting my time, but i'll do this 1 this time, i'll record it on video...and post a photobucket link so you can actually watch it on video, versus just seeing pictures |
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Post by yankee on Apr 25, 2009 11:38:24 GMT -5
Your funny chrono readings were probably due to the sabot passing over the chrony that close. 6'....YIKES. your probably right wilmsmeyer, but i was told in past years 6' to 8' from muzzle is what you want, and that has worked in the past with arrows and small caliber varmit rounds, the main trouble i had at this distance is muzzle gases bouncing the machine, once i watched the video in slow motion, holy smokes, im betting the tripod leaned backwards 4 to 5 inches |
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Post by tpcollins on Apr 25, 2009 16:17:13 GMT -5
yankee - what I think it will be is irrelevant since you'll probably skew the results to make it faster than it really is anyways.
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Post by yankee on Apr 25, 2009 17:25:24 GMT -5
see thats what i mean, how can i skew a video, it is what it is, enough said....again a waste of time for a response
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Post by artjr338wm on Apr 25, 2009 22:33:42 GMT -5
Not trying to hijack the thread, but I have a question for those more experienced than myself. Back in 2004 I was at the range helping a friend get his Encore ready for a NM Vali Vidal elk hunt. We were both shooting loads of 3-F 777 and 300grn XTPs.
It just so happened a fellow shooter was there with his 35p chronograph. The owner of the 35p wanted to know what fps we were getting so he asked me to shoot two shots through his chrono. Shot #1 printed out at 1996fps shot #2 printed out at 2018fps. I was shooting 130 grains by volume of 3-F 777. I was at that time, quite pleased with the velocity to say the least. I also at that time had no idea realy what the velocity should have been.
Now that I have learned alot more about 777, I am inclined to have doubts that those chrono readings were accurate and in fact were high by at least 150fps. I do not recall the distence the chrono was set at from my encore.
Am I correct in my thinking the velocities were high, and if so what does anyone think the cause most likely was?
Thanks,
Arthur.
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Post by yankee on Apr 26, 2009 6:33:09 GMT -5
other then comparing chrony to chrony with a known calibrated velocity, or send it to a lab to get it calibrated how would one know?? i send mine to competetion electronics in california once a year, to get it checked out, it is my opinion though that 130 grains of triple se7en by volume you were borderline overloading, according to my math you were right at 148grains of blackpowder
if you compared your velocities at 130 grains of triple 7
to my velocities of 110gr triple7, id say they was probably pretty close, although chronographs are a reference only tool and 10+ loads should be run through em and a average figured, see my first paragraph
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Post by tpcollins on Apr 26, 2009 8:27:10 GMT -5
artjr338wm - for once I'm going to have to agree with yankee - since 777 supposedly runs about 15% hotter than BP, and FFF is going to burn a bit quicker than FF so when you were shooting the equivelant of nearly 150 grains of powder pushing a 300 grain bullet, did you need a seat belt to keep you in the chair? I don't think I could shoot that setup accurately because I would be ready to flinch anticipating a big kick!
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Post by artjr338wm on Apr 26, 2009 17:55:47 GMT -5
Thanks for your reply Yankee. Tpcollins, recoil has not been a factor for my shooting from the bench for well over 15 years, ever since I bought and modified a "Benchmark Shooting rest". I modified it to hold a 25lb bag of shot and to be able to slide back during recoil. As kind of a side note, what I like most about this rest besides absorbing recoil, is unlike some other recoil absorbing rests, my POI does not change once I shoot from field positions.
I did this to the rest to help me deal with shooting my 338wm, 12ga sabot slugs and turkey loads, and prior to buying my Encore. The rest worked perfectly with my Encore as all I ever shot out of it prior to trying 3F-777 was three fifty grain pellets of Pyrodex RS. I fired at least 1500-1600 shots of 150grns of pellitized Pyrodex RS and 300grn XTPs. I then switched to 3F-777 and fired about 200 loads using 130 grains of 3F-777 and 300grn XTPs. Although I finally settled on using 120 grain charges of 3F-777 as my testing showed that was the most accurate load in my Encore.
Now I am shooting BH 209 and will never go back to any other BP sub I used before.
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Post by tpcollins on Apr 26, 2009 18:16:38 GMT -5
artjr338wm - is this the rest your're talking about? www.opticsplanet.net/pro-ears-benchmaster-bench-mark-bmk.html I've tried several in the past couple of years and wasn't happy with any of them. So I modified my old Outer's Varmenteer to reduce the spring that was always present with it - I'm hoping my modifications works. It actually is similar to the one in the link. |
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Post by artjr338wm on Apr 26, 2009 22:22:53 GMT -5
TP, Mine is the rest design they sold prior to the one you linked.
I attached two half circles of steel to to bottom of my front two screws on the rest that are used for height adjustments and removed the rear screw and place the back end of the rest frame on a American Eagle rabbit ear rest filled with heavy sand.
I then place a 25lb bag of shot on the frame. The end result is a rest that recoils strait back, but now that it weighs about 30lbs my felt recoil is reduced to a level so low I can easily tolerate all day shooting of even my 10ML-II pushing 300grn bullets over 2400fps. And BTW a 12ga 3.5" magnum turkey load shot from the bench makes my 338wm recoil out to be softer than baby sh!t by compairson. I have shot little else that kicks more savagely than a 7lb 870 firing 12ga- 3.5" magnum turkey loads.
It also allows me to shoot extremely good groups.
I have over the years drawn up a few rest designs I feel would have no equal in terms of recoil reduction and ease of use, just never was willing to spend the $$$ developing them.
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