![]() ![]() You'll still need some minor tweaks once you screw the extra metal on. Just because some others don't have luck with COL doesn't mean you can't look for a little more room depending on how long the throat is on your rifle.Īnd finally, things are going to change when you add the can. The the extra case capacity should give you an idea on what happens when you have more room to work with.ĭon't be afraid to play with the OAL some more, 2.810" with a little more room could increase case capacity. Or with a different bullet, maybe a 200gr or Hornady 195. This works with a lot of stick powders like IMR-4895 and even tiny ball like W748. You could also try vibrating or tapping a case after the powder drop, see if it starts to settle some before seating the bullet. With less tension it should back the bullet out some to give you an idea on how/if you are compressing a load. Another way to see/test a compressed load is to take a slightly over belled case and seat a bullet. You will hear it usually when you are compressing a load. Weigh what you have, maybe do this with different headstamps to get an idea what accepts the most powder.Īs for the crunch, its called that for a reason. I would attempt to test case capacity first. Hope that is more applicable info to the question. Didn't seem to matter that the round nose was lead tip. I'm sure they'll work ok and accuracy seemed to be ok though not as good as the SMK's but minute of pig is all you normally need.Performance on target was about the same as the SMK, 100yds you peeled the jacket off the bullet and splattered lead on steel, 200yds you squished the whole bullet flat, 300yds it flattened the front half and 400yds about the first third. 7gr more powder to get the same velocity and we figured that was due to the extra contact area on the bullet. ![]() The drop at 200 was about 10-12 inches more with the RN compared to the SMK of the same weight. I don't know about wind as we weren't shooting when it was windy. The draggier round nose will drop more and at the ranges we were shooting (up to 400yds) the drop is substantially higher with the round nose. It does make a big difference in ballistics. What I found is that it doesn't seem to make much difference in subsonics what shape the nose is for killing things. I have fired 200gr round nose in the 30-221 thinking they would be better for putting holes in game that would kill them quicker than the spitzer types. It took me a bit to see that you were asking for 220RN info but I did finally see it. If you're only shooting out to 300 it may not make much difference. The only problem with them is that they have more drag and slow down quicker so they don't have the range the slicker HPBT's do. The round nose bullets are normally much shorter and need less spin to remain stable. On the other hand if you want to toss the round nose 220 you would likely be fine. We are shooting 30-221, 300 whisper, 300 blackout using twist rates of 7-8 inchs in order to stabilize these long heavies so 10in isn't really there. Sticking with the lighter bullets for you would make sense from that standpoint. I've done some repairs on suppressors used with that bullet and twist in common. On the other hand the heaviest bullet may not stabilize and I think with a 10 in twist you're on the edge with a 220 gr bullet with a pointy end and a boattail. Because of that the advantage in the subsonics is normally with the heaviest bullet you can throw. The whole point behind subsonic shooting is to retain as much energy as possible while reducing noise.
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