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What is the thing on the end of the barrel a silencer?or some sort of tuning device?
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Old Bear, its called a suppressor, which reduces the bang at the gun to about the same as a 223. It can't silence as the ammo isn't subsonic, so you still get the crack of the supersonic bullet.
At the longrange the game still hear the bullet in the air, but they can't pinpoint where its coming from.
It also acts as a fixed tuner to some extent. See comments above.
2211 isn't available here anymore either, but I have 1 and a bit 15kg drums left. Its similar in burning rate to 2218, slower if anything. It works great in the 7mm/404 and 7mm RUM giving 100% loading density, good velocity and superb temperature insensitivity.
Have you tried the Vihtavuori slow powders, 24N41 and 20N29? The latter is extremely slow and gives awesome velocities, but I found powder fowling a real issue with it. The velocity and pressure just kept climbing as you fired more shots of the same load. You needed to clean after each group, which may not be an issue for a longrange big game hunter, but no good for varminting or competition.
Greg, Thanks for the information on the burning rate of AR2211 and its temperature insensitivity. Wish ADI would reconsider its decision not to release it anymore. Was Vithtavouri 20N29 slower burning than AR2211?
I have considered using 24N41 & 20N29, and spoke to the Vihtavouri Oz agent about 3 months ago, and he said if I ordered at least 3kg of either one, he could include it in the next shipment in about 1 years time.
I decided to order the 20N29, as most burning rate charts place 24N41 around the same as AR2218 (H50BMG), and I am mainly interested in something slower. Have you tried 24N41?
The 257 Weatherby with the 156 grain ULD is my first serious attempt at a long range hunting rifle on medium game. So even if 20N29 fouls excessively, I should be able to handle it during my normal daily hunting cycle.
I certainly don't intend to use the 257W as a long range varmint rifle, as I have several other rifles that can be set up as a specialist long range varmint rifles. In any event there aren't many rabbits here anymore, as when the calici virus was released in 1995, nearly all the rabbits swam over to NZ to escape to safety.He!He!
Out of curiosity, what is the case capacity of the the 7mm/404? As a comparison, I have some new 7mm RUM cases on the shelf waiting for a project, and they hold 114 grains of ball powder (109.5 to the base of the neck).
Just got back from a goose, pig and varmint hunting trip down south for the week, so sorry for not replying sooner.
I've got some 24N41, but haven't tried it yet.
7mm/404 capacity is very similar to 7mm RUM, but performance is better due to excellent RWS brass.
I had some reamers ground in a 7mm/338 Lapua improved a while ago as I was running out of RWS 404 brass and the Lapua is superb. I'm putting one together at the moment. I think the capacity will be slightly less than Kirby's 7mm AM.
I've been shooting a short 7mm/338 Lapua for a while now, its the ultimate short magnum! Gives STW performance out of a short action.