Why don’t you consider the Weatherby Mark V Light Weight in .300 WBY Mag? Since you like Weatherby already, MRSP $1900 not cheap but maybe cheaper than going custom, here’s the ballistics of .300 WBY Mag compared to .300 WSM. Its only 5 ¾ lbs and looks good. Very comparable but may kick like a mule being so light though. Other calibers it's made in .270 WBY MAG, 7mm Rem Mag, 7mm WBY Mag
.300 WSM (150 BT at 3300)
.300 WSM (180 Sp at 2970)
.300 Wby. Mag. (150 BT at 3540)
.300 Wby. Mag. (180 Sp at 3250)
.270 Wby. Mag. (130 Sp at 3375)
.270 Wby. Mag. (150 Sp at 3245)
7mm Rem. Mag. (140 BT at 3150)
7mm Rem. Mag. (150 Sp at 3110)
7mm Rem. Mag. (160 Sp at 2950)
7mm Wby. Mag. (154 SP at 3260)
7mm Wby. Mag. (160 Sp at 3200)
.300 WSM (150 BT at 3300)
.300 WSM (180 Sp at 2970)
.300 Wby. Mag. (150 BT at 3540)
.300 Wby. Mag. (180 Sp at 3250)
.270 Wby. Mag. (130 Sp at 3375)
.270 Wby. Mag. (150 Sp at 3245)
7mm Rem. Mag. (140 BT at 3150)
7mm Rem. Mag. (150 Sp at 3110)
7mm Rem. Mag. (160 Sp at 2950)
7mm Wby. Mag. (154 SP at 3260)
7mm Wby. Mag. (160 Sp at 3200)
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