My usp compact in 45 has had really exceptional groups at 25 yds.
A true staple shooter.
Polygon barrels differ from land-and-groove by how they crimp the 'mass' of the bullet instead of gripping the outer edges.
I think (In my novice opinion, YMMV) that the best bullets in .45 flare out to full size so that the barrel can grip them around the middle of the bullet.
Some ammo in 45 grips near the front of the bullet (Broad nose, short, fat bullets), some bullets in 9mm grips more toward the rear of the bullet. (Heavily tapered slender, longer bullets.)
I suspect that where the bullet first contacts the rifling in a polygon barrel has a lot to do with accuracy.
I think personally that the bullet should contact the rifling half way down it's length, and be full size all the way to the end. Any sooner, and I suspect that the bullet doesn't have enough time to be centered in the bore before it engages the rifling.
Also, if it engages the rifling too late, it doesn't have time to 'correct' for it's own spin and again may not be perfectly straight with the bore.
Again, I may not be making any sense, and I'm a novice, so I may just be blowing smoke.
I also apologise, I've had no experience with 9mm and polygon barrels.
My only polygon-barreled gun is a .45
A true staple shooter.
Polygon barrels differ from land-and-groove by how they crimp the 'mass' of the bullet instead of gripping the outer edges.
I think (In my novice opinion, YMMV) that the best bullets in .45 flare out to full size so that the barrel can grip them around the middle of the bullet.
Some ammo in 45 grips near the front of the bullet (Broad nose, short, fat bullets), some bullets in 9mm grips more toward the rear of the bullet. (Heavily tapered slender, longer bullets.)
I suspect that where the bullet first contacts the rifling in a polygon barrel has a lot to do with accuracy.
I think personally that the bullet should contact the rifling half way down it's length, and be full size all the way to the end. Any sooner, and I suspect that the bullet doesn't have enough time to be centered in the bore before it engages the rifling.
Also, if it engages the rifling too late, it doesn't have time to 'correct' for it's own spin and again may not be perfectly straight with the bore.
Again, I may not be making any sense, and I'm a novice, so I may just be blowing smoke.
I also apologise, I've had no experience with 9mm and polygon barrels.
My only polygon-barreled gun is a .45
HK Specialist pride ourselves on providing the best deals on a wide variety of guns, parts, and accessories. We are constantly striving to present the best experience to our customers and to give a superior customer service experience. Aug 07, 2008 Looked at an HK 770 (.308, hunting style rifle) for sale at a local shop.It seems to be in decent shape and has a good Leupold scope on it. They are asking $1500 if I remember correctly which is a pretty good price compared to the military style HK91 but I really don't know what the going rate might be for these things.