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Post by doc12 on Nov 24, 2015 14:43:31 GMT -5
Thanks guys for the response to my last post about suggested loads for 45 apex conversion. I have a Slufoot converted 45-70 Bergera barrel. Went to the range today and tried 56 grains H4198 with Barnes 195 and light blue harvester sabot. Sabot and bullet went down the barrel without much difficulty. Federal primer used and could not get the load to fire. Primer went off and pushed the load 1/3 of the way down the barrel. Tried 4 times without success. Temp was 32 degrees. I suspect I'm not getting enough compression due to the easy fit of the bullet/sabot down the barrel. Is knurling the only option in this situation? Would another powder work with less compression? Thicker walled sabot? Thanks!
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Post by smokelessindian84 on Nov 24, 2015 15:37:00 GMT -5
I knurled bullets thinking that would fix the same problem and it may have helped but to insure 100% ignition in cold temps with loose fitting bullet/sabots I would recommend using AA 5744 as a booster if you are wanting to shoot 4198 as your main charge.
5744 would also work by itself as a single with lower velocities of course.
The Barnes bullets are slightly undersized .398-.399 also where the Hornadys measure .400
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Post by lakeplainshunter on Nov 24, 2015 15:41:56 GMT -5
There is also IMR SR4759 for the booster if you can find it. I would knurl and duplex.
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Post by Deleted on Nov 24, 2015 15:53:40 GMT -5
Even a small amount of any of the shotgun powders (blue dot, red dot, clays, unique, green dot) will work. 5 grains will go a long ways.
Try knurling the bullets up and if you have win 209 primers try them. They are not as hot but should seal better.
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Post by rangeball on Nov 24, 2015 16:07:34 GMT -5
A duplex may take care of the firing part but the loose fit may not produce the best accuracy. I would certainly try knurling them up. You want a good medium tight fit. The H4198 should light up.
If you don't want to knurl you can also paper patch inside the sabot. This may actually give you a more consistent fit.
Unfortunately there are no thicker walled sabots in a .45 that I'm aware of.
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Post by lwh723 on Nov 24, 2015 16:31:07 GMT -5
Did you have all oil and grease removed from barrel? I've had poor accuracy from loose fitting loads, but never a FTF with H4198 and a mag primer in the sabot guns. Since slufoot fit the BP, I assume you're getting no leakage around your primer?
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Post by doc12 on Nov 24, 2015 17:43:33 GMT -5
I cleaned the gun and ran a patch with a very small amount of oil. Maybe that was the cause, too slick for the sabot possibly. If I do go to a duplex load, say 10 grains of 5744, should I decease the grains of my primary powder? Luke, any other bullet choices to shoot saboted out of that barrel that may fit a bit tighter?
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Post by smokelessindian84 on Nov 24, 2015 18:57:04 GMT -5
My Apex seemed to fit tighter at the muzzle then looser at the breech end. Accuracy was good just fought failure to fires with it in cold temps with straight 4198.
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Post by mimath314 on Nov 24, 2015 19:03:54 GMT -5
I had a FTF with H4198. But I think the issue was on me and proper loading as I was reloading after missing a doe 2 weeks ago and she came back to the same spot while I was loading. I failed to get a good seat with my sabot/bullet and snapped 2 caps before I realized what happened. Stood up, applied more pressure to seat the bullet (about .25 to .4 of an inch), and no problem.
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Post by miketodd58 on Nov 24, 2015 19:06:29 GMT -5
Thanks guys for the response to my last post about suggested loads for 45 apex conversion. I have a Slufoot converted 45-70 Bergera barrel. Went to the range today and tried 56 grains H4198 with Barnes 195 and light blue harvester sabot. Sabot and bullet went down the barrel without much difficulty. Federal primer used and could not get the load to fire. Primer went off and pushed the load 1/3 of the way down the barrel. Tried 4 times without success. Temp was 32 degrees. I suspect I'm not getting enough compression due to the easy fit of the bullet/sabot down the barrel. Is knurling the only option in this situation? Would another powder work with less compression? Thicker walled sabot? Thanks! Seems like to me I remember Mr Hankins addressing this issue once before. That its not the fit of the bullet its the ignition system. If I recall his HIS igition system pretty much works in any temperature and with basically a slip fit on the bullet. No need to have a hammer down on the load. |
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Post by Dave W on Nov 24, 2015 20:01:04 GMT -5
I cleaned the gun and ran a patch with a very small amount of oil. Maybe that was the cause, too slick for the sabot possibly. If I do go to a duplex load, say 10 grains of 5744, should I decease the grains of my primary powder? Luke, any other bullet choices to shoot saboted out of that barrel that may fit a bit tighter? Yes, decrease the primary charge weight. |
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Post by scottypotty on Nov 24, 2015 21:17:43 GMT -5
My set up is with an Encore but similar, I use a Slufoot converted 45-70 Bergera with 57grs of H4198 and federal primers, 195 Barnes and light blue sabots. I've had this problem too, what I did was to stop cleaning the barrel. Since then it has fired on the first shot every time. To be fair, I haven't had it in cold temps yet (NE Ohio temps.)
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