Re: Caliber for a Conteder?
As noted all the TCU's are a good choice. The son of the guy who came up with the TCU line likes the .25 TCU best for weight vs. velocity.
For a li'l bump in power, the 7-30 waters is about the best ballistically. It can push a 140 gr. 7mm bullet at 2400 from a 14" barrel. where as the 6.5mm can only get a 120 gr. up to that speed (smaller diameter = more pressure) But still, pushing a 123 high BC bullet at very close to 2400 is no slouch. You're not far behind a full length rifle barreled 6.5 Grendel.
For all intents and purposes, you can sort of categorize cases that work in the Contender. Some cases run too high of pressure and are better suited to the Encore frame. The 6.5 JDJ's lineage and the 7-30 Waters lineage comes from the 30-30.
The TCU lineage comes from the .223
A 30-30 based or sized case (improved) is about as big as you want to go in a Contender frame. This includes the 6.5 Grendel and 6.8 SPC.
If you want to get one of the cases based on the BR line I recommend going to the Encore frame, but they have been chambered on the Contender. One thing I have noted is how much recoil I can take. I have moderately tough hands. However, I find about 20 of the 30-30 based cases is all I want to shoot. More like around 50 with the TCU's.
So, for range, just get something that shoots a high BC. 6mm, 6.5mm or 7mm. For hunting weight bullets any of the three work just as well. Although again, the .25 TCU is excellent at both as well.
You'll be amazed at the accuracy of the Contenders. I've shot 2" groups from a bench @ 300 with mine.