Bullet weights are similar and the velocities are the same. Using a 223 subsonic is no different that a. When you start loading subs, do not put the can on before you ensure the pills aren't tumbling at 100.ġ/12: 180 grain and below for the SMK types designes (AMAXs, FMJ, anything with a pointed tip and boattail) 190's with a RN designġ/10: 200 and below for pointed designs, 220 for RN designsġ/8: 240 and below for pointed design, I don't know of a 30 cal round nose design greater than 220. These results have been mentioned by JD Jones who has built a business out of the subsonic quandry. Conversly, I argue that the SMKs will tumble and leave a wound like a knife that can't be shut off by body matter. Enty holes are going to be caliber diameter and if you are after hogs, deer, or similar sized game, the entry wound is likely to be filled with fat, tissue, or guts. In looking at the typical energy and momentum generated by the more popular 223, 6mm and 308 sub loads, I'm not convinced that the bullet can expend enough energy to both expand and exit the body. There are several people out there working on softer hollow point designs that will expand at sub velocities, but I contend that an exit wound with these type of rounds (those that don't have a significant/effective hydrostatic shock) is critical to a recovery of the animal. The wound channel was the diameter of the bullet with no expansion. Several years ago I started out with hornady 220 RNSPs and had results (not great, but I never lost a deer since I was using a rest out of a box stand and put them through the lungs or heart). The longer the bullet, the faster the twist required.įOR HUNTING: Right now I'm set on the SMKs as they are just barely stable (given the appropriate twist v/s weight) and will tumble causing a wound channel similar to a broadhead. ![]() The SMK design requires a longer bullet to achieve the same weight. ![]() To shoot a SMK type design, I have to drop down to the 190s to get stable departure from the bore. However, a 220 SMK will not be stable enough and strike the baffels in the can on the same barrel. For comparison, I can shoot 220 RNSPs out of my 1/10 barrel and stack them into the same hole at 100 in the absense of wind. With that said I've found that SMKs can be just as accurate as long as you have the proper twist rate. Just crony it with a goal of 1050 to get the max energy and remain below the transsonic range.įOR PUNCHING PAPER: Round nose bullets (or anything shaped like a tear drop) has been proven to be the most stable in subsonic flight. If you follow protocol of working loads down instead of the traditional up, you won't stick a bullet in the bore. A sub load won't harm a barrel, it's creating far less pressure than a hot load. ![]() My harbinger (GAP/SH build from a few years ago) loves 10.5 gr of TB with 200SMKs. 11 grains (some rifles will need a little less or a little more depending on barrel length) and you'll have a consisitent, accurate load for any 1/10 twist rifle. Stuff a 200 SMK or greater round nose design in there with approx. 15 grains will completely fill a 308 case. TrailBoss is a very bulky powder designed for cowboy action shooting. There's also titegroup, red dot, green dot powders Trailboss 9.5 - 10.7 gr find a spot were there is no super sonic crack. From everything i've pulled out of various threads:ġ50+ grain bullets, Rn mostly as the below the speed of sound doesn't require pointy things
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