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Long Range Hunting & Shooting
Which .338???
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<blockquote data-quote="Long Time Long Ranger" data-source="post: 432813" data-attributes="member: 505"><p>Both the 338-300 ultramag and 338 ultramag have a base diameter 0f .55" and a shoulder diameter of .525". The 338 RUM is .09" shorter. I know ten years ago when I was fooling with these two all the time we tried putting one in the other at my range but can't remember now. I think the 338 RUM would fit into the 338-300 chamber. The specs say it will anyway. I have both, I guess I could go find out and get back on here. It wouldn't shoot very well though if it did because of the .09" length difference.</p><p> </p><p>Pyrodux, At the shot show in 2001 a Remington representative there when asked the question why they shortenned the 338RUM and didn't just neck up the 300 RUM this is what he said. To get proper feeding we would have to seat the 338 bullets to deep into the case if we kept the 300 RUM case length. The shortenned version feeds through our action much better without modification and allows us to seat the bullets out properly. Through extensive testing we found there was virtually no performance difference between the shortenned version we went with versus using the full length 300 ultramag case.</p><p> </p><p>After the shot show I tested the 338-300 ultramag I had been doing for three years extensively head to head with the new 338 RUM on the 1000 yard range beside my shop. My testing verified what remington said at the shot show. Through the full range of bullets from 200-300 grains there was very little difference between the two and certainly not enough to give one a noticeable performance advantage over the other. With the 300 grain bullets both averaged around 2800 fps with best accuracy loads in 30" barrels with most I tested ranging from 2750-2850 fps. That was with powders available during that time ten years ago. My personal 338 RUM I hunt with now shoots the 300 grain smk 2730 fps with best accuracy. It is an off the shelf rem 700 stainless with the standard 26" barrel. If you extrapolated that out to a 30" barrel it would be about 2810 fps which is right in there about average for both cartridges.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 432813, member: 505"] Both the 338-300 ultramag and 338 ultramag have a base diameter 0f .55" and a shoulder diameter of .525". The 338 RUM is .09" shorter. I know ten years ago when I was fooling with these two all the time we tried putting one in the other at my range but can't remember now. I think the 338 RUM would fit into the 338-300 chamber. The specs say it will anyway. I have both, I guess I could go find out and get back on here. It wouldn't shoot very well though if it did because of the .09" length difference. Pyrodux, At the shot show in 2001 a Remington representative there when asked the question why they shortenned the 338RUM and didn't just neck up the 300 RUM this is what he said. To get proper feeding we would have to seat the 338 bullets to deep into the case if we kept the 300 RUM case length. The shortenned version feeds through our action much better without modification and allows us to seat the bullets out properly. Through extensive testing we found there was virtually no performance difference between the shortenned version we went with versus using the full length 300 ultramag case. After the shot show I tested the 338-300 ultramag I had been doing for three years extensively head to head with the new 338 RUM on the 1000 yard range beside my shop. My testing verified what remington said at the shot show. Through the full range of bullets from 200-300 grains there was very little difference between the two and certainly not enough to give one a noticeable performance advantage over the other. With the 300 grain bullets both averaged around 2800 fps with best accuracy loads in 30" barrels with most I tested ranging from 2750-2850 fps. That was with powders available during that time ten years ago. My personal 338 RUM I hunt with now shoots the 300 grain smk 2730 fps with best accuracy. It is an off the shelf rem 700 stainless with the standard 26" barrel. If you extrapolated that out to a 30" barrel it would be about 2810 fps which is right in there about average for both cartridges. [/QUOTE]
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Which .338???
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