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Post by deadeye on Apr 2, 2014 23:26:35 GMT -5
**disclaimer-this load may or may not be safe in your firearm**with a storm moving in potentially & just approx. 2hr window got home to launch a few & play with this duplex in which onecardchuck & davew have had great luck with other bullets 300gns & under. after thinking about this for 2 weeks here was my plan of attack. started out with 12/58 @ 200yds-2584,73 fps  adjusted to a 12/60...2611,2599 fps  went approx. 6" vertical//// adjusted to 15/56....2601,2589fps..bugholer@200yds,same photo circled & marked//went to 435yd bench for a 3 shot (not photo'd due to time)approx. 12" horizontal with a approx. 5"vertical-so I went back to 200yd with a small adjustment of 15/57...2620,21 fps another 2shot bugholer @ 200yds(hit much high forgetting to dial back down) board-mismarked-should have read 15/57  just enough time to launch 3 more @ 435yds-result-approx 5" horizontal with only approx. 2"vertical/very good considering winds were very shifty & could not gauge from my position due the wind coming from blind spot & little to nothing to read from. after I walked out & the wind was surge & stall. with this short test I'm thinking the n110/322 combo is working well for all the mh line from 275-327gns maybe a fine -tune adjustment if needed woody will be back in the game/fingers crossed! |
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Post by Deleted on Apr 3, 2014 0:42:18 GMT -5
Good shooting deadeye, appreciate the testing and report. I too like the N110/H322 combo, so thanks for exploring different charges and bullets. Great stuff...
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Post by Deleted on Apr 3, 2014 6:24:29 GMT -5
Great report!
Thanks for sharing!
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Post by edge on Apr 3, 2014 7:57:07 GMT -5
Hard to complain about that  It does show the point that what works best for someone may need some tweaking in your own rifle. edge. |
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Post by Richard on Apr 3, 2014 8:35:58 GMT -5
Good report!
I may have to try it with 4759 substituted for the N-110. And, some generic 300 gr. SST's
Somehow, I am getting the feeling that velocities with these 300 gr. bullets are comfortable in and around 2600 to 2700 fps when relatively low ES's can be achieved (in the 25 fps range or so--I don't think single digits are absolutely necessary). I think it tends to keep pressures (with the right powders of course) in the safe zone and rotator cuff surgery at bay!
Richard
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Post by deadeye on Apr 3, 2014 11:41:38 GMT -5
edge & Richard I totally agree- I have noticed out of this barrel velocities around 2625-2650 are best but not all duplex combo's are good accuracy wise. looking back in my early sabotless I was extremely lucky finding great loads,as I have recently found cutting 3/4" off barrel made a huge difference from a sub-moa to moa + gun. I see how someone could get aggravated easily trying to find the load,twisting these duplexes around has been an eye-opener for me. there is a lot going on within the sml barrel. maybe later try to find Earnhardt's higher node  |
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Post by onecardchuck on Apr 3, 2014 12:41:08 GMT -5
Excellent,
Glad this load is working out for you. I am at 15/55 right now and am going to start tweaking with my next few range sessions much like you have done hear. Learned much from your testing here keep up the great work.
I want to see if I can't improve upon my last results as I was able to set the FF dye a hair larger for the Barnes TSX's and still be able to get them down the barrel using two hands. I am currently in the 2600 to 2700 fps range and want to fully see my results before determining if there is a need to try 2700 - 2800 fps with my setup, but that would probably put this load above 50 KPsi to get there so I would probably switch to BD/Benchmark to keep it under 50KPsi.
Good shooting and keep up the great work.
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Post by jims on Apr 3, 2014 18:45:26 GMT -5
deadeye: Nice shooting as usual and a good write-up.
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Post by Dave W on Apr 5, 2014 9:46:09 GMT -5
Nice trigger work Jeff. The N110/H322 combo is probably my favorite. With consistent variables the results are usually excellent accuracy and small ES.
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Post by deadeye on Apr 10, 2014 22:12:42 GMT -5
update- this load is on the edge high pressure wise(54k) & though it is very accurate & low es gonna abort due to the following/gas cut marks on plug   I think 322 is just a tad too fast for the 327's pressue wise due to gas cutting the plug so I spent the afternoon after this going back to 3031 as a main w/ h4198 as booster...15/65 @ 2630fps// had 1 6"x6" steel gong set up @ 200yds,another @ 280yds w/ winds whipping approx. 20mph//had no problem hitting those in these conditions w/ this load(no pic's) even though not proven for accuracy day -in day out. same plug but visually no additional cutting so far.. during this process I came up with a couple other observations/thoughts regarding fouling/copper/bore & an opinion on orfice sizes from warm to colder weather. |
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Post by onecardchuck on Apr 11, 2014 15:50:49 GMT -5
Deadeye,
Thanks for the heads up on the gas cutting with the 15/57 load using the 327. I can only assume using a 300 grain bullet that I am not far off from if not already slightly above (50Kpsi) with the 15/55 load. I have no gas cutting that I can see.
Since I cannot find IMR3031 and I did find Benchmark which should be a comparable powder. I am probably going to move forward with a BD/Benchmark duplex under the 300 grain bullet. I do have one question for you though.
Why did you choose to go with H4198 as your booster to IMR3031?
Thanks again for your informative posts and look forward to your future results.
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Post by deadeye on Apr 11, 2014 16:43:40 GMT -5
Deadeye, Thanks for the heads up on the gas cutting with the 15/57 load using the 327. I can only assume using a 300 grain bullet that I am not far off from if not already slightly above (50Kpsi) with the 15/55 load. I have no gas cutting that I can see. Since I cannot find IMR3031 and I did find Benchmark which should be a comparable powder. I am probably going to move forward with a BD/Benchmark duplex under the 300 grain bullet. I do have one question for you though. Why did you choose to go with H4198 as your booster to IMR3031?Thanks again for your informative posts and look forward to your future results. I think because they were fairly close together burning rate wise,i was new to duplexing & just wanted to get a safe feel for it,turns out to be the best in my gun w/ 327 in the approx. 41k/2625fps area. with the 327 I get a lot of vertical with fast booster's unless I back those off to around 5gns. my goal now is to find an accurate load in the 47k-50k @ approx. 2625fps. I have bypassed the 100yd bench to 200yds to save bullets,so many 100yd groups not so good @ 200yds |
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Post by onecardchuck on Apr 12, 2014 18:48:21 GMT -5
Deadeye,
Well me and you seem to be on the same mission 47K to 50K anywhere in the 2600 - 2800 fps range. I am also trying to get the load to be temperature insensitive. I agree with you 100% on bypassing the 100 yard bench as way to many of my groups have looked good at 100 only to disappoint at 200 as well. I look forward to your future results as I learn a lot from them I should be getting to the range here in the next few weeks and will post how I make out.
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