remington 7400 chamber brush cleaning

[spispeza]

will be getting rem. 742 in 6mm,a rem.7400 270 win. soon,question is will a chamber brush for a m 1 garand/m1a work for these?how often should i clean the chambers,other areas for 100% reliablility/functioning.
also any recommendations on suitable powders for reliable functioning.will be using 100gr.bullets in the 6mm,130gr.bullets for the 270.
plan on using unfired brass for both calibers,then buying rcbs small base dies for both.if i need them.any other suggestions?thanks

[Rick Teal]

I would expect the brush to be OK for the .270, since the case is essentially the 30-06.  I don't know about the 6mm since it has more taper then the '06, however, I use my 30-06 Remington chamber brush on my 6mm, so unless the brush you have has a thick centre or is inflexible, I'd expect it to be OK.

I use IMR 4350 for the 6mm and haven't had a problem with jamming (42.5 gr gave me 2870 fps), but I haven't tried any of the newer powders in it.  My 30-06s found 4350 to  be too slow, and I got my best results with IMR 4320, but again, I plan to try some of the newer powders.  IMR 4064 is usually recommended for the 30-06 in the Remington autos, but I could never get it to produce the velocities I wanted in my guns.

[Dave in WV]

Remington included a chamber brush with my 7600. It is a bronze brush with a handle shaped like a long shallow Z to use through the ejection port.