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Post by buckeye68 on Oct 16, 2022 8:59:27 GMT -5
I have been down the road you’re on for nearly 2 decades (totally, jumped off 3-4 years ago). For 20 years my PN 40/ML2 would shoot knurled 200g XTPs and SSTs well sub-MOA and, up thru 2,900’/sec. However, my 45PN /10ML2s could do the same, and even past 3,000. Things got better in both calibers with sized Furys and Pittmans. However, the converted 45/70s seemed more accurate, for me, with sabots than bore sized. I think this has to do with the lesser bore size consistency of these factory barrels. Sabots are far more forgiving than bore sized bullets in lower quality barrels. Plus, the 40 cal bullets have a better BC and less recoil. Yes, you can really feel the inconsistency bullet to bore in the factory CVA barrel. Its not horrible but definitely noticable. Iv lapped it as much as I dare already. With sabots its smooth and consistent all the way down. The sabots will rebound past inconsistencies and keep a good seal for hunting which is what I am really concerned about. The other factor is wild temp swings during my two ML seasons. Could be 70 or could be 5. The sabots help take up slack from cold contraction. Above all else they give me confidence with all my concerns. After the season I plan for some real world controlled testing with condensation and I will test with bullet to bore as well. Is there a barrel ever perfect?? It’s great how a not so perfect barrel will shoot a .713” @ 400 yards.
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miked
Junior Member
Posts: 88
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Post by miked on Oct 18, 2022 11:14:40 GMT -5
Yes, you can really feel the inconsistency bullet to bore in the factory CVA barrel. Its not horrible but definitely noticable. Iv lapped it as much as I dare already. With sabots its smooth and consistent all the way down. The sabots will rebound past inconsistencies and keep a good seal for hunting which is what I am really concerned about. The other factor is wild temp swings during my two ML seasons. Could be 70 or could be 5. The sabots help take up slack from cold contraction. Above all else they give me confidence with all my concerns. After the season I plan for some real world controlled testing with condensation and I will test with bullet to bore as well. Is there a barrel ever perfect?? It’s great how a not so perfect barrel will shoot a .713” @ 400 yards. I have had 3 different ML barrels and all have had some inconsistency. Two of those have been CVA. I have never had too much issue shooting sub moa with sabots in any of them when you figure out what it wants. The problem I have had bullet to bore with them is they get "molded" by a choked part of the barrel and end up loose over the powder. On the bench right after loading they shoot fine but bouncing around in the Jeep and slogging miles and miles in the woods I need to be confident it didn't move or allow moisture in. Sticking my 3 piece ramrod down there every 5 minutes is not something I want to do. Im getting excellent groups, seal, ignition and speed with sabots in my temperature ranges with the bullet I want to use so I am a very happy camper going into this season.
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Post by sew on Oct 22, 2022 9:10:23 GMT -5
One size doesn’t fit all.
In some rifles (generally converted 45/70s, and other lower quality barrels) , sabots really have an advantage verses bore sized bullets. Also with reduced loads, saboted bullets can have an advantage.
In high quality barrels, heavy bullets/heavy powder loads, obturation occurs so fast the there is little, if any , advantage of full sized verses smooth sized. Lighter bullets and or lighter powder loads then full sizing increasingly is advantageous. Same with annealing - the less the pressure, the lighter the bullet, the more annealing helps .
One size doesn’t fit all.
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