04-29-2012, 01:39 PM
Seems like magic!
I wonder how similar sectional density bullets in .308 would work? That would be a bullet weighing close to 220 grs. I seem to remember that there's a number of sub-sonic loads for that weight and caliber.
Back to topic -- this is an intriguing quest. The gas port being so far out in the rifle-length barrel makes it difficult to get enough impulse without pushing the bullet too fast. That might explain why the short barrel guys have a better chance at getting subsonic and cycling the action.
I have seen some cast bullet designs that appear to have a long bore-riding nose so that the bullet can be very long indeed. Creating a mold can be expensive, but one could make enough brass bullets with a lathe to see if it could work. Of course the cast bullet would be the shortest for the weight.
I wonder how similar sectional density bullets in .308 would work? That would be a bullet weighing close to 220 grs. I seem to remember that there's a number of sub-sonic loads for that weight and caliber.
Back to topic -- this is an intriguing quest. The gas port being so far out in the rifle-length barrel makes it difficult to get enough impulse without pushing the bullet too fast. That might explain why the short barrel guys have a better chance at getting subsonic and cycling the action.
I have seen some cast bullet designs that appear to have a long bore-riding nose so that the bullet can be very long indeed. Creating a mold can be expensive, but one could make enough brass bullets with a lathe to see if it could work. Of course the cast bullet would be the shortest for the weight.