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Long Range Hunting & Shooting
shot today: 338 rum and edge-have ???'s
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<blockquote data-quote="Long Time Long Ranger" data-source="post: 388287" data-attributes="member: 505"><p>lamiglas, I just went back and found your question hidden in there. I just scanned over it the first time. 90 grains of h-1000 with the 300 smk is on the hot side for the 338 rum. Every gun is different so if it shoots it shoots. Mine is a rem 700 and it will shoot that load but I am off the lands with the seating depth so it will feed through the action. Your 338-300 ultramag should go a few grains hotter than 90. Key to it is where you get your accuracy. Retumbo does well in my 338-300's also. </p><p></p><p>When I did all the tests with both of these back in 2001 when the 338 rum came out it just depended on the individual barrel as to velocity difference. Apples to apples you get a fast barrel in one and a slow barrel in the other it changes things dramatically. At my range I had the opportunity to chrono many rifles. If I averaged out all the data with best accuracy loads in each there is probably 50-75 fps difference on average but with barrels many times you don't get average. After shooting them head to head and getting the data I didn't see a need to continue building the 338-300's any more after the 338 rum came out. They were so close and the 338 rum was over the counter products so I didn't see the advantages of the 338-300 worth the disadvantages of doing it over the 338 rum. This was a tough decision because I had spent all that time designing the best 338-300 ultramag chamber and throat since remington released the specs on the 300 ultramag back in the 90's. I also had done that same work on the 7mm-300 rum and 358-300 rum. I still have two of each of those original rifles I kept for myself. I really like the 358 version but it just never took off because of no high bc quality bullets in 358. It is a killing machine though out to 800 yards or so. If velocity was important for a guy that was shooting over 1000 yards then it made more sense to step up a couple hundred fps to the 338-378 wby and the improved versions in a custom rifle instead of the slight increase the 338-300 ultra gives you over the 338 rum. Or improve the 338 lapua case and go that route which gives an extra 100+ fps over the 338-300 ultra.</p><p></p><p>The design I settled on with the 338-300 ultra was on average the fastest considering the loads and velocities I see posted on the internet. Most guys could get 2900 fps with the 300 smk with my design. From what I read on here the average seems to be 2750-2850 fps with the 338-300. All of them I did were specialized for long range elk hunting. I don't know how many guys are still on the site using them since I quit doing them about ten years ago. Back then there were several guys from Colorado reporting long range accuracy and elk kills with those first rifles. The 338-300 ultramag is a great cartridge but so is the 338 rum. Just not really enough seperation there to make one noticably better than the other. Like I say a guy would need to step up to the improved lapua case or 378 case to gain enough seperation to make it a worthwhile move over the 338 rum. Each guy decides for himself which is worthwhile, that is why there are thousands of different variations of cartridges out there.</p><p></p><p>Sniper2 is still on here. He might could report the velocities all the guys down his way are getting with those first rifles. I think all of those were 28-30 inch barrels.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 388287, member: 505"] lamiglas, I just went back and found your question hidden in there. I just scanned over it the first time. 90 grains of h-1000 with the 300 smk is on the hot side for the 338 rum. Every gun is different so if it shoots it shoots. Mine is a rem 700 and it will shoot that load but I am off the lands with the seating depth so it will feed through the action. Your 338-300 ultramag should go a few grains hotter than 90. Key to it is where you get your accuracy. Retumbo does well in my 338-300's also. When I did all the tests with both of these back in 2001 when the 338 rum came out it just depended on the individual barrel as to velocity difference. Apples to apples you get a fast barrel in one and a slow barrel in the other it changes things dramatically. At my range I had the opportunity to chrono many rifles. If I averaged out all the data with best accuracy loads in each there is probably 50-75 fps difference on average but with barrels many times you don't get average. After shooting them head to head and getting the data I didn't see a need to continue building the 338-300's any more after the 338 rum came out. They were so close and the 338 rum was over the counter products so I didn't see the advantages of the 338-300 worth the disadvantages of doing it over the 338 rum. This was a tough decision because I had spent all that time designing the best 338-300 ultramag chamber and throat since remington released the specs on the 300 ultramag back in the 90's. I also had done that same work on the 7mm-300 rum and 358-300 rum. I still have two of each of those original rifles I kept for myself. I really like the 358 version but it just never took off because of no high bc quality bullets in 358. It is a killing machine though out to 800 yards or so. If velocity was important for a guy that was shooting over 1000 yards then it made more sense to step up a couple hundred fps to the 338-378 wby and the improved versions in a custom rifle instead of the slight increase the 338-300 ultra gives you over the 338 rum. Or improve the 338 lapua case and go that route which gives an extra 100+ fps over the 338-300 ultra. The design I settled on with the 338-300 ultra was on average the fastest considering the loads and velocities I see posted on the internet. Most guys could get 2900 fps with the 300 smk with my design. From what I read on here the average seems to be 2750-2850 fps with the 338-300. All of them I did were specialized for long range elk hunting. I don't know how many guys are still on the site using them since I quit doing them about ten years ago. Back then there were several guys from Colorado reporting long range accuracy and elk kills with those first rifles. The 338-300 ultramag is a great cartridge but so is the 338 rum. Just not really enough seperation there to make one noticably better than the other. Like I say a guy would need to step up to the improved lapua case or 378 case to gain enough seperation to make it a worthwhile move over the 338 rum. Each guy decides for himself which is worthwhile, that is why there are thousands of different variations of cartridges out there. Sniper2 is still on here. He might could report the velocities all the guys down his way are getting with those first rifles. I think all of those were 28-30 inch barrels. [/QUOTE]
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shot today: 338 rum and edge-have ???'s
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