22BR 22BR Improved 22 dasher

[skeetlee]

Are these all different chambering? Whats the difference? what would be the best choice for shooting 75gr a-max bullets in a fast twist barrel. I was really wanting a 22-250AI but most say the 22br is a better choice. so i thought what about the 22 dasher. A little more speed but i know squat about it. info needed. Lee

 

[BradY]

You will need custom dies for the dasher i think. Or at least get a set of 22BR dies reamed to suit.

BR improved,BRX) use the same dies as a BR but have a spacer underneath the die.

the brx and dasher you probably wont notice much between, but the improved ones will be equal to your 22-250AI with less powder required and you get all the inherent accuracy and efficiency from the parent BR case.

 

[RDavies]

Is this for target or field? If it is for target, with a 22/250 Imp, you will start to get to the speeds where bullets might start coming apart, or just plain not being as accurate after a few shots. I started off with big cased 22s, but they were rechambered back to 22BRs and a 22BRX and accuracy and consistancy came back. No problems and very consistant over 39 shots between cleans. I would consider a 22 dasher as maximum for target use.
If it is for the field, then the 22/250 Imp wil be accurate enough and give you the speed you wil want for flat trajectory, as well as more whack at the target, as well as feeding through a magazine.
The basics are this.
22BR aprox 31gns capacity
22BRX is a 22BR with the shoulder blown .100' forward. Aprox 34gns capacity
the 22 dasher has the shoulder blown forward .100', but it has less body taper and a 40 degree shoulder. Approx 36gns capacity
std 22/250 approx 40gns capacity
22/250 imp aprox 43gns capacity