Re: 338RUM or 338/300RUM in 28" tube?
I have tested dozens of rifles in each of these cartridges. For every 338-300 RUM that shoots over 2850 fps there is also a 338 RUM that does so. For every 338-300 RUM that shoots 2750 fps there is a 338 RUM that does so. They are so close the individual barrels and rifles make more difference than there is between the two cartridges. Performance is to close to make a determination. I just want to make sure people understand who are considering building one or the other that they are not making a choice based on the mythical advantage some think a 338-300 RUM has over the 338 RUM. Both are equally accurate and equally powerful cartridges. I was building rifles in 338-300 RUM in 1998 probably well before anyone on here ever heard of it and tested it extensively against the 338 RUM in 2001-2 time frame when it came out.
Average accuracy loads fall in the same range with both cartridges. The only difference is one is a standard cartridge with cheap over the counter components and one is a wildcat. The 338-300 has the extra trouble of forming brass. Brass for either is easy to get. Unfortunately right now 300 RUM brass is hard to get but that is just an anomaly. A couple years ago the 338 RUM was hard to get but typically both are easy to find. Both brass will be with us until we are gone. I can still get 32-20, 35 whelen, 45-70 and all kinds of off the wall old stuff so no need to worry about something as popular as these two not being around during our useful life.
Predictions are difficult, especially when they involve the future
Last edited by Long Time Long Ranger; 04-24-2012 at 11:23 PM.