The pre-64 NRA stock, standard or monte-carlo, both work very well for scope use. It's no secret, just mount the scope correctly, low and close, and it works perfectly. Mount the scope too high so it's sticking up and catching on everything, of course it's not going to work, and you'll be groping for eye relief.
I've not heard of any weakness from the pre-64 M70 in long action magnum calibers The Model 70 came available in 1936 in 9 calibers; 22 Hornet, 220 Swift, 250-3000 Sav, 257 Roberts, 270 Win, 7 MM, 30-06, 300 H&H Mag and 375 H&H Mag. The pre-64 was an improved upon M54. The length of the receiver was designed to accommodate all these 9 calibers long and short. The pre-64 action is very strong and has been used over the decades for many high end custom rifles.
Here's a photo of my 1953 M70 in 300 H&H. Standard NRA stock with a Leupold B/C VX-3 scope. The scope is mounted correctly and the rifle comes up quick for easy eye relief. Works perfect.
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I've not heard of any weakness from the pre-64 M70 in long action magnum calibers The Model 70 came available in 1936 in 9 calibers; 22 Hornet, 220 Swift, 250-3000 Sav, 257 Roberts, 270 Win, 7 MM, 30-06, 300 H&H Mag and 375 H&H Mag. The pre-64 was an improved upon M54. The length of the receiver was designed to accommodate all these 9 calibers long and short. The pre-64 action is very strong and has been used over the decades for many high end custom rifles.
Here's a photo of my 1953 M70 in 300 H&H. Standard NRA stock with a Leupold B/C VX-3 scope. The scope is mounted correctly and the rifle comes up quick for easy eye relief. Works perfect.

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